/**
 * @file
 * @brief Analog Input objects, customize for your use as required.
 * @author Steve Karg <skarg@users.sourceforge.net>
 * @date 2005
 * @copyright SPDX-License-Identifier: MIT
 */
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "bacnet/bacdef.h"
#include "bacnet/bacdcode.h"
#include "bacnet/bacenum.h"
#include "bacnet/config.h"
#include "bacnet/basic/object/ai.h"
#include "bacnet/basic/services.h"

#ifndef MAX_ANALOG_INPUTS
#define MAX_ANALOG_INPUTS 2
#endif

static float Present_Value[MAX_ANALOG_INPUTS];
static bool Out_Of_Service[MAX_ANALOG_INPUTS];
static BACNET_ENGINEERING_UNITS Units[MAX_ANALOG_INPUTS];

/* These three arrays are used by the ReadPropertyMultiple handler */
static const int32_t Analog_Input_Properties_Required[] = { PROP_OBJECT_IDENTIFIER,
    PROP_OBJECT_NAME, PROP_OBJECT_TYPE, PROP_PRESENT_VALUE, PROP_STATUS_FLAGS,
    PROP_EVENT_STATE, PROP_OUT_OF_SERVICE, PROP_UNITS, -1 };

static const int32_t Analog_Input_Properties_Optional[] = { -1 };

static const int32_t Analog_Input_Properties_Proprietary[] = { -1 };

void Analog_Input_Property_Lists(
    const int32_t **pRequired, const int32_t **pOptional, const int32_t **pProprietary)
{
    if (pRequired)
        *pRequired = Analog_Input_Properties_Required;
    if (pOptional)
        *pOptional = Analog_Input_Properties_Optional;
    if (pProprietary)
        *pProprietary = Analog_Input_Properties_Proprietary;

    return;
}

void Analog_Input_Init(void)
{
    return;
}

/* we simply have 0-n object instances. */
uint32_t Analog_Input_Index_To_Instance(unsigned index)
{
    return index;
}

/* we simply have 0-n object instances. */
unsigned Analog_Input_Instance_To_Index(uint32_t instance)
{
    return instance;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then you need validate that the */
/* given instance exists */
bool Analog_Input_Valid_Instance(uint32_t object_instance)
{
    unsigned index = 0;

    index = Analog_Input_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_INPUTS) {
        return true;
    }

    return false;
}

/* we simply have 0-n object instances. */
unsigned Analog_Input_Count(void)
{
    return MAX_ANALOG_INPUTS;
}

bool Analog_Input_Object_Name(
    uint32_t object_instance, BACNET_CHARACTER_STRING *object_name)
{
    char text[32];
    bool status = false;
    unsigned index = 0;

    index = Analog_Input_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_INPUTS) {
        snprintf(text, sizeof(text), "AI-%lu", (unsigned long)object_instance);
        status = characterstring_init_ansi(object_name, text);
    }

    return status;
}

float Analog_Input_Present_Value(uint32_t object_instance)
{
    float value = 0.0;
    unsigned index = 0;

    index = Analog_Input_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_INPUTS) {
        value = Present_Value[index];
    }

    return value;
}

void Analog_Input_Present_Value_Set(uint32_t object_instance, float value)
{
    unsigned index = 0;

    index = Analog_Input_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_INPUTS) {
        Present_Value[index] = value;
    }
}

bool Analog_Input_Out_Of_Service(uint32_t object_instance)
{
    unsigned index = 0;
    bool value = false;

    index = Analog_Input_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_INPUTS) {
        value = Out_Of_Service[index];
    }

    return value;
}

void Analog_Input_Out_Of_Service_Set(uint32_t object_instance, bool value)
{
    unsigned index = 0;

    index = Analog_Input_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_INPUTS) {
        Out_Of_Service[index] = value;
    }
}

bool Analog_Input_Units_Set(uint32_t object_instance, uint16_t value)
{
    unsigned index = 0;
    bool status = false;

    index = Analog_Input_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_INPUTS) {
        Units[index] = value;
        status = true;
    }

    return status;
}

uint16_t Analog_Input_Units(uint32_t object_instance)
{
    unsigned index = 0;
    uint16_t value = UNITS_NO_UNITS;

    index = Analog_Input_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_INPUTS) {
        value = Units[index];
    }

    return value;
}

/* return apdu length, or -1 on error */
/* assumption - object already exists */
int Analog_Input_Read_Property(BACNET_READ_PROPERTY_DATA *rpdata)
{
    int apdu_len = 0; /* return value */
    BACNET_CHARACTER_STRING char_string = { 0 };
    BACNET_BIT_STRING bit_string = { 0 };
    uint8_t *apdu = NULL;

    if ((rpdata == NULL) || (rpdata->application_data == NULL) ||
        (rpdata->application_data_len == 0)) {
        return 0;
    }
    apdu = rpdata->application_data;
    switch (rpdata->object_property) {
        case PROP_OBJECT_IDENTIFIER:
            apdu_len = encode_application_object_id(
                &apdu[0], rpdata->object_type, rpdata->object_instance);
            break;
        case PROP_OBJECT_NAME:
            Analog_Input_Object_Name(rpdata->object_instance, &char_string);
            apdu_len =
                encode_application_character_string(&apdu[0], &char_string);
            break;
        case PROP_OBJECT_TYPE:
            apdu_len =
                encode_application_enumerated(&apdu[0], rpdata->object_type);
            break;
        case PROP_PRESENT_VALUE:
            apdu_len = encode_application_real(
                &apdu[0], Analog_Input_Present_Value(rpdata->object_instance));
            break;
        case PROP_STATUS_FLAGS:
            bitstring_init(&bit_string);
            bitstring_set_bit(&bit_string, STATUS_FLAG_IN_ALARM, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_FAULT, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_OVERRIDDEN, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_OUT_OF_SERVICE,
                Analog_Input_Out_Of_Service(rpdata->object_instance));
            apdu_len = encode_application_bitstring(&apdu[0], &bit_string);
            break;
        case PROP_EVENT_STATE:
            apdu_len =
                encode_application_enumerated(&apdu[0], EVENT_STATE_NORMAL);
            break;
        case PROP_OUT_OF_SERVICE:
            apdu_len = encode_application_boolean(
                &apdu[0], Analog_Input_Out_Of_Service(rpdata->object_instance));
            break;
        case PROP_UNITS:
            apdu_len = encode_application_enumerated(
                &apdu[0], Analog_Input_Units(rpdata->object_instance));
            break;
        default:
            rpdata->error_class = ERROR_CLASS_PROPERTY;
            rpdata->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            apdu_len = BACNET_STATUS_ERROR;
            break;
    }

    return apdu_len;
}

/* returns true if successful */
bool Analog_Input_Write_Property(BACNET_WRITE_PROPERTY_DATA *wp_data)
{
    bool status = false; /* return value */
    int len = 0;
    BACNET_APPLICATION_DATA_VALUE value = { 0 };

    /* decode the some of the request */
    len = bacapp_decode_application_data(
        wp_data->application_data, wp_data->application_data_len, &value);
    /* FIXME: len < application_data_len: more data? */
    if (len < 0) {
        /* error while decoding - a value larger than we can handle */
        wp_data->error_class = ERROR_CLASS_PROPERTY;
        wp_data->error_code = ERROR_CODE_VALUE_OUT_OF_RANGE;
        return false;
    }
    switch ((int)wp_data->object_property) {
        case PROP_PRESENT_VALUE:
            status = write_property_type_valid(wp_data, &value,
                BACNET_APPLICATION_TAG_REAL);
            if (status) {
                if (Analog_Input_Out_Of_Service(wp_data->object_instance)) {
                    Analog_Input_Present_Value_Set(
                        wp_data->object_instance, value.type.Real);
                } else {
                    wp_data->error_class = ERROR_CLASS_PROPERTY;
                    wp_data->error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
                    status = false;
                }
            }
            break;
        case PROP_OUT_OF_SERVICE:
            status = write_property_type_valid(wp_data, &value,
                BACNET_APPLICATION_TAG_BOOLEAN);
            if (status) {
                Analog_Input_Out_Of_Service_Set(
                    wp_data->object_instance, value.type.Boolean);
            }
            break;
        case PROP_UNITS:
            status = write_property_type_valid(wp_data, &value,
                BACNET_APPLICATION_TAG_ENUMERATED);
            if (status) {
                if (value.type.Enumerated <= UINT16_MAX) {
                    Analog_Input_Units_Set(
                        wp_data->object_instance, value.type.Enumerated);
                } else {
                    status = false;
                    wp_data->error_class = ERROR_CLASS_PROPERTY;
                    wp_data->error_code = ERROR_CODE_VALUE_OUT_OF_RANGE;
                }
            }
            break;
        case PROP_OBJECT_IDENTIFIER:
        case PROP_OBJECT_NAME:
        case PROP_OBJECT_TYPE:
        case PROP_STATUS_FLAGS:
        case PROP_EVENT_STATE:
            wp_data->error_class = ERROR_CLASS_PROPERTY;
            wp_data->error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
            break;
        default:
            wp_data->error_class = ERROR_CLASS_PROPERTY;
            wp_data->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            break;
    }

    return status;
}
